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API Testing Tools

Tools focused on API payloads, authentication, encoding, and lightweight response checks. Useful for QA engineers, API testers, SDETs, and backend developers who need quick in-browser utilities during debugging and test creation.

QA engineers API testers Backend developers SDET Automation engineers

API Response Workflow

A concise sequence to inspect API responses and related artifacts. Open each step to run the tool on live payloads.

  1. Format JSON — prettify and validate response payloads.
  2. Validate JSON — check for syntax errors and common pitfalls.
  3. Compare JSON responses — detect regressions between builds or environments.
  4. Decode JWT — inspect token claims, scopes, and expiry.
  5. Decode Base64 — reveal encoded response sections for inspection.
  6. Encode URL parameters — ensure safe parameter transmission in HTTP requests.
  7. Check HTTP response bodies — compare headers or captured output from traces.
  8. Generate consistent test keys — normalize identifiers for assertions.
  9. Convert timestamps — switch between Unix epoch and readable dates.

JSON/API Data

4 tools

JSON Formatter

Beautify, validate, and inspect JSON payloads used by APIs.

JSON Viewer

Explore nested JSON objects for quick debugging and verification.

JSON to PDF

Export JSON responses to PDF for sharing or archival.

PDF to JSON

Extract structured JSON from PDF reports or API documentation.

Authentication

2 tools

JWT Decoder

Decode JWTs to inspect claims, headers, and expiry during auth debugging.

Hash Generator

Generate common hashes used in signatures and verification checks.

Encoding

2 tools

Base64 Encoder

Encode and decode Base64 payload fragments and headers.

URL Encoder

Encode query parameters and inspect URL-safe values.

HTTP

1 tool

Text Compare

Compare raw response bodies or header dumps during regression checks.

Test Data

3 tools

Case Converter

Generate consistent test keys, identifiers, and field names across systems.

Find & Replace Text

Mutate sample payloads and create variant test inputs quickly.

Remove Extra Spaces

Clean whitespace and formatting before comparing responses.

Date & Time

1 tool

Age Calculator

Convert dates, calculate age, and sanity-check timestamps in payloads.

Related categories

Free QA & Testing Tools Developer Tools JSON Tools DevOps Tools